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问题 单项选择题

气动操作的反推有哪两种设计？（）

A.一个驱动装置驱动了两半反推和两个驱动装置各驱动一半反推

B.一个气动驱动装置，一个液压驱动装置

C.一个机械驱动，一个电驱动

D.一个液压驱动，一个电驱动

答案

参考答案：A

填空题

阿司匹林抑制血栓形成，是由于减少了血小板内 ① 生成。
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单项选择题

The software architecture of a program or computing system is the structure or structures of the system, which comprise software______, the externally ______ properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a ______ that enables a so, ware engineer to: analyze the ______ of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the ______ associated with the construction of the software.

A．visible
B．reliable
C．secure
D．robust
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